Here you can find the source of createDocument()
static public synchronized Document createDocument()
//package com.java2s; /*//from ww w.j a va 2 s . co m * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ import javax.xml.parsers.DocumentBuilder; import org.w3c.dom.Document; import org.w3c.dom.Element; public class Main { /** * DocumentBuilder that is aware of namespaces. This is necessary for parsing xsl files. */ private static DocumentBuilder documentBuilder = null; /** * Returns a document newly created by the class's static DocumentBuilder. * * @return An empty DOM document. */ static public synchronized Document createDocument() { return documentBuilder.newDocument(); } static public synchronized Element createDocument(String rootElemName) { // create document Document doc = createDocument(); Element root = doc.createElement(rootElemName); doc.appendChild(root); return root; } }